异丙醇和苯液相烷基化反应制备异丙苯

研究MWW结构的有机硅微孔沸石催化剂在苯和异丙醇液相烷基化反应中的性能,考察反应温度、反应压力和空速等对催化剂催化性能的影响。结果表明,反应温度低于150℃时,催化剂活性和稳定性较差,主要反应为烷基化反应及异丙醇的分子内脱水和分子间脱水反应,反应产物为异丙苯、丙烯和异丙醚。反应温度高于170℃时,催化剂活性和稳定性良好,异丙醇接近完全转化,主要反应为烷基化反应,主要产物为异丙苯和多异丙苯。随着原料空速的增大,异丙醇转化率和异丙苯选择性降低,异丙醚和丙烯选择性增大。反应压力(1.5~2.5)MPa时,反应为液相烷基化过程,反应压力的变化对催化剂催化性能影响较小。

Liquid phase alkylation of benzene with isopropanol to cumene

The performance of organic silicon microporous zeolite catalyst with MWW structure for liquid phase alkylation of benzene with isopropanol was studied.The effects of reaction temperatures, reaction pressure and space velocity on the performance of the catalyst were investigated.The results indicated that when the reaction temperature was below 150 ℃,the catalyst possessed poor activity and stability,and the dominating reactions were alkylation,intermolecular and intramolecular dehydration of isopropanol,and the main products were cumene,propylene and isopropyl ether.The catalyst exhibited good activity and stability,and the dominating reactions were alkylation reaction with isopropanol conversion close to 100% and the main products were cumene and polyisopropylbenzenes when the reaction temperature was higher than 170 ℃.With the increase of raw material space velocity,isopropanol conversion and the selectivity to cumene decreased while the selectivity to propylene and isopropyl ether increased.The reaction was preceded in a liquid phase within the reaction pressure of （1.5-2.5） MPa,and the change of the reaction pressure had little effect on the performance of the catalyst.